CN-122000165-A - DCT type superconducting coil and optimization method thereof

CN122000165ACN 122000165 ACN122000165 ACN 122000165ACN-122000165-A

Abstract

The invention provides an optimization method of a DCT type superconducting coil, which comprises the steps of dividing a multilayer coil of the DCT type superconducting coil into a basic field coil and an adjusting field coil, wherein the basic field coil is used for generating a basic field, the adjusting field coil is used for generating an adjusting field, modeling the basic field coil once, acquiring first magnetic field data of the basic field coil based on a basic field coil model obtained by modeling, modeling the adjusting field coil, performing iterative optimization based on the first magnetic field data and an adjusting field coil model obtained by modeling until a magnetic field generated by the multilayer coil meets preset conditions, and determining parameters of the multilayer coil corresponding to the magnetic field meeting the preset conditions as target parameters.

Inventors

ZHU YI
YANG WENJIE
Rui Tenghui
SHI JIAN
FENG AO
MA LIZHEN

Assignees

国科离子(杭州)医疗科技有限公司
兰州泰基离子技术有限公司

Dates

Publication Date: 20260508
Application Date: 20260120

Claims (10)

1. A method of optimizing a superconducting coil of the DCT type, comprising: dividing a multi-layer coil of a DCT type superconducting coil into a basic field coil for generating a basic field and a tuning field coil for generating a tuning field; Modeling the basic field coil once, and acquiring first magnetic field data of the basic field coil based on a basic field coil model obtained by modeling; Modeling the adjusting field coil, and performing iterative optimization based on the first magnetic field data and the adjusting field coil model obtained by modeling until the magnetic field generated by the multi-layer coil meets preset conditions; and determining the parameters of the multilayer coil corresponding to the magnetic field meeting the preset conditions as target parameters.
2. The optimization method according to claim 1, wherein the dividing the multi-layer coil of the DCT-type superconducting coil into the basic field coil and the tuning field coil comprises: determining an outermost coil of the multi-layer coil as the adjustment field coil; and determining the other coils except the outermost coil in the multi-layer coil as the basic field coil.
3. The optimization method according to claim 1 or 2, wherein modeling the conditioning field coil, performing iterative optimization based on the first magnetic field data and the modeled conditioning field coil model until the magnetic field generated by the multi-layer coil meets a preset condition, includes: And carrying out iterative optimization on the coil end size parameter and the section current density distribution parameter of the adjusting field coil based on the first magnetic field data until the magnetic field jointly generated by the basic field coil and the adjusting field coil meets the preset condition.
4. The optimization method of claim 3 wherein said coil end dimension parameters include end length of said tuning field coil and number of coil turns and said cross-sectional current density distribution parameters include a dipolar field component, a quadrupolar field component, a hexapole field component, an octapole field component.
5. The optimization method according to claim 4, wherein iteratively optimizing the coil end dimension parameter and the cross-sectional current density distribution parameter of the adjustment field coil based on the first magnetic field data until the magnetic field jointly generated by the base field coil and the adjustment field coil satisfies a preset condition, comprises: Based on an adjusting field coil model, adjusting the end length and the number of coil turns of the adjusting field coil so that the effective length of the DCT type superconducting coil meets design requirements; And loading the first magnetic field data, and adjusting the cross-section current density distribution of the adjusting field coil by adjusting the diode field component, the quadrupole field component, the hexapole field component and the octapole field component within a preset range based on an adjusting field coil model so as to optimize the magnetic field uniformity of the multi-layer coil until the magnetic field generated by the multi-layer coil meets preset conditions.
6. The optimization method of claim 5, wherein the cross-sectional current density of the conditioning field coil is cosine distributed across the conditioning field coil cross-section.
7. The optimization method according to claim 5, wherein the preset range of the diode field component, the preset range of the quadrupole field component, the preset range of the hexapole field component, and the preset range of the octapole field component are all-0.1 to 0.1; The preset range of the end length of the adjusting field coil is 100 mm-150 mm, and the number of turns of the adjusting field coil is 18-25 turns.
8. The optimization method according to claim 1, characterized in that the current loading in the DCT-type superconducting coil does not exceed 70%.
9. The optimization method of claim 1 wherein the multilayer coil has a magnetic field uniformity on the order of parts per million.
10. A DCT-type superconducting coil characterized in that the DCT-type superconducting coil is optimized by the optimizing method according to any one of claims 1 to 9.

Description

DCT type superconducting coil and optimization method thereof Technical Field The disclosure relates to the technical field of medical equipment, in particular to the field of superconducting magnets of medical ion therapy accelerators, and particularly relates to a DCT type superconducting coil and an optimization method thereof. Background DCT (Discrete Cosine Theta) type superconducting magnets are widely used in medical ion accelerators because of their advantages of short ends, high excitation efficiency, capability of multipolar recombination, and the like. For miniaturized medical ion accelerators using DCT-type superconducting magnets, it is generally desirable to produce a uniform magnetic field of about 4T within a larger bore, which requires the use of a multi-layer nested DCT-type superconducting coil structure to produce a sufficient magnetic field. In order to realize optimization of magnetic field uniformity, the multi-layer coil is usually required to be optimized after being completely modeled, and the optimization process of complex structure is slow. Disclosure of Invention In view of this, the present disclosure provides a DCT-type superconducting coil and an optimization method thereof. An aspect of the disclosed embodiments provides an optimization method of a DCT type superconducting coil, which includes dividing a multi-layer coil of the DCT type superconducting coil into a basic field coil and an adjusting field coil, wherein the basic field coil is used for generating a basic field, the adjusting field coil is used for generating an adjusting field, modeling the basic field coil once, acquiring first magnetic field data of the basic field coil based on a basic field coil model obtained by modeling, modeling the adjusting field coil, performing iterative optimization based on the first magnetic field data and an adjusting field coil model obtained by modeling until a magnetic field generated by the multi-layer coil meets preset conditions, and determining parameters of the multi-layer coil corresponding to the magnetic field meeting the preset conditions as target parameters. According to an embodiment of the present disclosure, the multi-layer coil of the DCT type superconducting coil is divided into a base field coil and a tuning field coil, including determining an outermost layer coil of the multi-layer coil as the tuning field coil and determining other coils except the outermost layer coil in the multi-layer coil as the base field coil. According to the embodiment of the disclosure, modeling is performed on the adjusting field coil, iterative optimization is performed on the basis of the first magnetic field data and the adjusting field coil model obtained through modeling until a magnetic field generated by the multi-layer coil meets preset conditions, and the method comprises the steps of performing iterative optimization on coil end size parameters and section current density distribution parameters of the adjusting field coil on the basis of the first magnetic field data until the magnetic field jointly generated by the basic field coil and the adjusting field coil meets preset conditions. According to an embodiment of the present disclosure, the coil end dimension parameters include an end length of the tuning field coil and a number of coil turns, and the cross-sectional current density distribution parameters include a diode field component, a quadrupole field component, a hexapole field component, an octapole field component. According to the embodiment of the disclosure, the coil end size parameter and the section current density distribution parameter of the adjusting field coil are iteratively optimized based on the first magnetic field data until the magnetic field jointly generated by the base field coil and the adjusting field coil meets preset conditions, and the method comprises the steps of adjusting the end length and the coil turns of the field coil based on an adjusting field coil model to enable the effective length of the DCT type superconducting coil to meet design requirements, loading the first magnetic field data, and adjusting the section current density distribution of the adjusting field coil based on the adjusting field coil model within a preset range to adjust the diode field component, the quadrupole field component, the hexapole field component and the octapole field component so as to optimize the magnetic field uniformity of the multi-layer coil until the magnetic field generated by the multi-layer coil meets the preset conditions. According to an embodiment of the present disclosure, the cross-sectional current density of the conditioning field coil is cosine distributed over the conditioning field coil cross-section. According to the embodiment of the disclosure, the preset range of the diode field component, the preset range of the quadrupole field component, the preset range of the hexapole field component and the preset range of the oct